3. Federal Aviation Regualtions for Sailplane Pilots. Doris Grove

It must be just me but I've never understood to point of this book. Regs
change all the time and how often is it updated? Everything you need to
know, regulation wise, is online.
http://ecfr.gpoaccess.gov/cgi/t/text....1.1.2&idno=14
http://ecfr.gpoaccess.gov/cgi/t/text...1.3.10&idno=14